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This study presents a revolutionary computer-aided surgery planning and simulating system under computer-based environment for the calcaneal osteotomy surgery. This system uses the full-scale 3D reverse engineering technique in designing and developing preoperative planning system for the calcaneal osteotomy surgery. The planning system provides full-sized three-dimensional images of the calcaneus and the interior measurements of the calcaneus from various cutting planes. This study applies computer-assisted technology to integrate different software's function into a surgical planning system. These functions include 3D image model capturing, cutting, moving, rotating and measurement for relevant foot anatomy, and can be integrated as the user's function. Furthermore, the system is computer-based and computer-assisted technology. Surgeons can utilize it as part of preoperative planning to develop efficient operative procedures. This system also has databank that can update and extend, and will provide the clinical cases to different users for experience learning.